Secrecy analysis of a Cognitive Radio Network with an adaptive path selection based transmission scheme and JTAPS relay

This paper investigates the secrecy outage performance of a Cognitive Radio Network (CRN), where we propose an adaptive path selection based transmission scheme to transmit the information from the source to destination. The transmit power of the secondary user (SU) and relay is limited due to underlay CRN to maintain the maximum acceptable interference at the primary user (PU) receiver. The secondary network uses an intermediate relay between source and destination to harvest energy from the transmission of the radio frequency (RF) signal of SU following a joint time allocation and power splitting (JTAPS) protocol. Here we use the hybridization of two known energy harvesting (EH) protocols by combining the time allocation (TA) and power splitting (PS) factor to make more efficient use of the EH method in evaluating physical layer secrecy. We develop analytical expressions for secrecy outage under JTAPS and the effect of time allocation (TA) and power splitting (PS) factor on the secrecy outage probability (SOP) is investigated. Our proposed JTAPS scheme yields 12% reduction in SOP with respect to TSR scheme at an energy harvesting factor alpha = 0.6. (C) 2020 Elsevier GmbH. All rights reserved.